Characterization of the human iris spectral reflectance with a multispectral imaging system.
We present a multispectral system developed and optimized for measurement of the spectral reflectance and the color of the human iris. We tested several sets of filters as acquisition channels, analyzed different reconstruction algorithms, and used different samples as training sets. The results obtained show that a conventional three-channel color camera (RGB) was enough to reconstruct the analyzed reflectances with high accuracy, obtaining averaged color differences of around 2-3 CIEDE2000 units and root mean square errors of around 0.01. The device developed was used to characterize 100 real irises corresponding to 50 subjects, 68 prostheses used in clinical practice, and 17 cosmetic colored contact lenses.
Vilaseca
Meritxell
M
Centre for Sensors, Instruments and Systems Development (CD6), Technical University of Catalonia (UPC), Rambla Sant Nebridi 10, Terrassa, Barcelona 08222, Spain. mvilasec@oo.upc.edu
Mercadal
Rita
R
Pujol
Jaume
J
Arjona
Monserrat
M
de Lasarte
Marta
M
Huertas
Rafael
R
Melgosa
Manuel
M
Imai
Francisco H
FH
D000465:Algorithms; D005127:Eye Color; D005137:Eye, Artificial; D005240:Feasibility Studies; D006801:Humans; D007498:Iris / Q000502:physiology*; D007909:Lenses; D008029:Lighting; D010781:Photography / Q000295:instrumentation; D012542:Scattering, Radiation